There are 3 books in the McLean Twins series. The newest book is Black Coven which came out in 2016.

1
Black Diamond

Book cover of Black Diamond
After her mom’s sudden death twelve-year old Shannon McLean has to move from the US to the England’s countryside to live with her mysterious father, Connor, whom she hasn’t seen since she was a baby. Weird things start to happen and the whole place scares the crap out of Shannon.…
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2
Demon's Touch

Book cover of Demon's Touch
Shannon McLean had come a long way since she lost her mother. A while ago she’d thought she was alone in the world, a plain Jane with no place to go. Now she knew better. Suddenly she was surrounded by relatives: a crazy talented twin brother, Ian, who literally held…

3
Black Coven

Book cover of Black Coven
Part Three of McLean Twins Series. The final part of the thrilling McLean Twins series is here! Every child knows that demons cannot be saved… … but Shannon and Ian had to try. Failing … well, that wasn’t an option. Facing an enemy worse than they have ever seen, they…